Woodward 8915-118 | Governor | Controller | Potential Converter
1.8915-118 Product Overview
The Woodward 8915-118 belongs to the 505/505E series digital turbine controllers. It is a microprocessor-based control module designed for single-valve steam turbines,
including single extraction/admission systems or split-range actuator configurations.
The controller features a front panel Operator Control Panel (OCP) with a two-line, 24-character display and multi-function keypad, allowing easy on-site configuration and monitoring.
contacts： Mike
+86 18350224834 （WeChat/WhatsApp）
Email：Mike18350224834@gmail.com
2. 8915-118 Technical Specifications and Parameters
| Parameter | Details |
|---|---|
| Power Supply | +24 VDC, approx. 1 A |
| I/O Outputs | Discrete Outputs: 8 Analog Outputs: 6 Actuator Outputs: 2 |
| Display / HMI | Two-line, 24-character LCD, with multi-function keypad |
| Dimensions | Approx. 14 × 11 × 4 in (35.6 × 27.9 × 10.2 cm) |
| Weight | Approx. 9.11 lbs (4.13 kg) |
| Operating Temperature | –4 to +140 °F (–20 to +60 °C) |
| Storage Temperature | –40 to +185 °F (–40 to +85 °C) |
| Humidity Standard | 95% RH at 20-55 °C for 48 hours without damage |
| Protection Class | Typically meets industrial dust and water protection standards |
| Communication Protocol | Supports Modbus, RS-232 / RS-422 serial interfaces |
3. Brand History
Woodward, Inc., founded in 1870 and headquartered in Fort Collins, Colorado, USA, is a global leader in energy control systems. The company has a long history of innovation in turbine control, engine management,
and power generation systems.
Woodward products are widely recognized for their reliability and precision in demanding industrial and power generation applications.
4. Applications in Industrial Automation
The 8915-118 plays a critical role in industrial automation and power generation environments:
- Steam Turbine Control: Manages startup, speed regulation, and extraction/admission control of steam turbines.
- Power Generation Systems: Used in power plants to regulate turbine-driven generators for stable frequency and load management.
- Compressor and Pump Drive Control: Ensures precise speed control for turbine-driven compressors and pumps.
- Process Industry Applications: Applied in chemical plants, refineries, and other industries requiring precise turbine operation.
- Safety and Protection Functions: Includes overspeed protection, critical speed avoidance, actuator travel limits, and event logging for operational safety.
2、 Working principle
Half bridge driver:
The working principle of a half bridge driver is based on the alternating conduction and cutoff of two power switches. By adjusting the control signal,
the upper and lower bridge arms alternately open and close, thereby controlling the current flow and magnitude of the load.
In practical applications, the frequency and duty cycle of the control signal can be adjusted to achieve precise control of the load. For example,
in motor control, the speed and direction of the motor can be controlled by adjusting the duty cycle of the PWM signal.
Full bridge driver:
The working principle of the full bridge driver is also based on the alternating conduction and cutoff of power switches, but due to its four switching elements,
it can achieve more complex control strategies.
In motor control, the full bridge driver can achieve forward and reverse rotation and speed regulation of the motor by controlling the switching status
of the upper and lower bridge arms. Specifically, when the motor needs to rotate forward, a certain switch on the upper bridge arm is turned on, and the
corresponding switch on the lower bridge arm is also turned on; When the motor needs to be reversed, switch the switch state of the upper and lower bridge arms.
At the same time, the motor speed can be adjusted by changing the conduction time of the left and right bridge arms.
3、 Performance characteristics
Half bridge driver:
Simple structure: Due to only containing two power switching elements, the structure is relatively simple and the cost is low.
Flexible control: Although only half of the motor winding can be controlled, the other half of the winding can be controlled through external circuit coordination.
Low power utilization: Due to the fact that only forward or reverse current can be used for operation, the power utilization is relatively low.
Low power loss: Due to the small number of switching elements, the power loss is relatively low.
Full bridge driver:
Strong control flexibility: It can achieve bidirectional control by controlling the magnitude and direction of forward and reverse currents to control the direction and speed of the motor.
High power utilization: It can work with both forward and reverse currents simultaneously, achieving maximum power utilization.
Large torque and speed range: Due to the ability to provide larger currents and more complex control strategies, it is suitable for applications that require high efficiency and large currents.
High cost: Due to the complex structure and the need for more components and control circuits, the cost is relatively high
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